Question about Singer Sewing Machines

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Replacing broken gears on Singer Touch & Sew Model 648

With the machine laying over and the bottom cover removed the plastic gear on the vertical shaft to the right is broken. This gear meshes with the gear on the end of the horizontal shaft that works the bobbin/hook mechanism. I need to know how to remove these gears for replacement. I think I have found the correct gears at a Singer Parts Supplier but I can't figure out how to remove the old gears. There is apparently a procedure for this as neither gear can be removed unless one or both of the shafts are moved or ''loosened'' to provide clearance. Also if I make this repair sucessfully, is the timing going to be off or will it ''self adjust'' when the new gears properly installed and meshing as they should. Any help will be greatfully appreciated.

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  • lisacasey72 Apr 11, 2009

    Same problem - I'm loosening the set screws, but can't tell how to slide the shaft to remove the broken gear.


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Remove the plastic faceplate from the front of the machine. There is a Singer logo button that you will have to pop out to release it, and then the lever nobs to get around to get it off. You can then access the allen screw on the top gear.
Remove all the set screws on both the top and bottom gears on the vertical shaft. Put them in a safe place.
The vertical shaft sits directly below the horizontal shaft, but there is some space between them and wiggle room to do the following. If the shaft does not slip down easily, use a small diameter rod or screwdriver to gently tap the vertical shaft downward until the top gear slips off the end. Remove the gear.

Posted on Dec 17, 2011

  • 1 more comment 
  • Diagnosed
    Diagnosed May 04, 2014

    Wow Phil thank you so much for posting this!! I was midway through trying to make a video version of your instructions for everyone but my top gear's allen screws are rounded out in the hex slot :/. The closest fit I can get is with a 1.27cm allen key. You wouldn't happen to have any tips on what to do in this case would you?

  • Diagnosed
    Diagnosed May 04, 2014

    Just to clarify, the part number on mine is 163328 which surprised me as I know the original part for the 648 was No.163987...

  • Diagnosed
    Diagnosed May 04, 2014

    ... I meant 1.27mm allen key sorry


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Here is a link to a site where you can get a manual that will walk you through the replacement procedure for $10. I just ordered it and it has good instructions and great pictures.

Posted on Apr 12, 2010

  • zplum Apr 12, 2010

    I forgot to mention that it is a downloadable PDF document so you can start using it immediately.


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